基于电压前馈解耦的地铁永磁同步电机矢量控制研究

针对传统矢量控制系统中电流环使用PI调节器忽略交直轴电流耦合的问题,采用以d-q轴反馈电流和反馈速度为输入的电压前馈解耦单元,并将经过d-q轴电流调节器的输出作为补偿电压,与电压前馈解耦单元构成复合控制系统。在MATLAB/SIMULINK仿真软件下,搭建永磁同步电机矢量控制系统和电压前馈解耦模型,仿真分析在地铁牵引、惰行、制动3种工况下有负载扰动时的运行情况。仿真结果表明:与传统PI控制器相比,基于电压前馈解耦的PI控制器能使系统具有更好的动态性能。

Research on Vector Control of Metro Permanent Magnet Synchronous Motor Based on Voltage Feed-Forward Decoupling

In view of the flaw exhibited by the current loop in the conventional vector control system when using PI regulator without quadrature-direct axis current coupling, with d-q axis feedback current and feedback speed the input voltage feed forward decoupling unit, the output of the d-q axis current regulator serves as the compensation voltage, thus forming a compound control system with the voltage feed forward decoupling unit combined together. The vector control system of permanent magnet synchronous motor and the voltage feed forward decoupling model are set up under the MATLAB/SIMULINK simulation software, followed by a simulation analysis of the operating condition with load disturbance under three operating modes of metro traction, coasting and braking. The simulation results show that, compared with that of the traditional PI controller, the system of the PI controller based on voltage feed-forward decoupling is relatively superior in that it exhibits a better dynamic performance.